Do Not ever paint a tank flat black , they absorb heat , boil the fuel inside the tank & you will have vapor lock problems , the factory tanks are left silver for a reason , I have encounter fuel boiling problems twice here & I live in a cold climate
Ya know, its funny you said this.
When I was messing my my (once again goof y) fuel sending unit i noticed when I removed the unit this time that the vapros coming out of the tank thru that hole were "humid" and warm....this was after a test ride...
My tank was painted black by the body shop who redid the tank.
I have always had an issue with hot restarts....after the car sits for longer than 5 minutes or so after a drive, it has to crank much longer to start...I always assumed it was the carb heating up, but I wonder if the tank is contributing?
I assume it is the color that is absorbing heat right? So I could in theory just respray it siler or aluminum tone to help reflect heat?
Although I had a black motorycle a while ago...tank was balck...and THAT is in the hot sun directly, not hanging under the car like car gas tank would....and I never had issues? If that because of the size differences or because the bike tank is gravity fed?